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FINANCIAL INSTRUMENTS - Available-for-Sale Debt Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | $ 84.1 | $ 1,510.4
Unrealized losses less than 12 months, gross unrealized losses | (0.9) | (49.1)
Unrealized losses more than 12 months, fair value | 3,598.9 | 3,538.3
Unrealized losses more than 12 months, gross unrealized losses | (132.4) | (149.4)
Total unrealized losses, fair value | 3,683.0 | 5,048.7
Total unrealized losses, gross unrealized losses | (133.3) | (198.5)
U.S. treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 0.0 | 731.7
Unrealized losses less than 12 months, gross unrealized losses | 0.0 | (26.0)
Unrealized losses more than 12 months, fair value | 1,799.8 | 1,886.9
Unrealized losses more than 12 months, gross unrealized losses | (61.0) | (70.6)
Total unrealized losses, fair value | 1,799.8 | 2,618.6
Total unrealized losses, gross unrealized losses | (61.0) | (96.6)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 84.1 | 631.4
Unrealized losses less than 12 months, gross unrealized losses | (0.9) | (17.6)
Unrealized losses more than 12 months, fair value | 1,344.5 | 1,221.9
Unrealized losses more than 12 months, gross unrealized losses | (53.0) | (58.4)
Total unrealized losses, fair value | 1,428.6 | 1,853.3
Total unrealized losses, gross unrealized losses | (53.9) | (76.0)
U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 0.0 | 102.7
Unrealized losses less than 12 months, gross unrealized losses | 0.0 | (4.4)
Unrealized losses more than 12 months, fair value | 346.9 | 324.6
Unrealized losses more than 12 months, gross unrealized losses | (14.3) | (15.5)
Total unrealized losses, fair value | 346.9 | 427.3
Total unrealized losses, gross unrealized losses | (14.3) | (19.9)
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses less than 12 months, fair value | 0.0 | 44.6
Unrealized losses less than 12 months, gross unrealized losses | 0.0 | (1.1)
Unrealized losses more than 12 months, fair value | 107.7 | 104.9
Unrealized losses more than 12 months, gross unrealized losses | (4.1) | (4.9)
Total unrealized losses, fair value | 107.7 | 149.5
Total unrealized losses, gross unrealized losses | $ (4.1) | $ (6.0)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-5 + Details
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